/Engine/Plugins/JsonBlueprintUtilities/Source/JsonBlueprintUtilities/Public/JsonBlueprintFunctionLibrary.h
Gets all field names on the JsonObject
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Json") static bool GetFieldNames ( const [FJsonObjectWrapper](API\Runtime\JsonUtilities\FJsonObjectWrapper) & JsonObject, [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & FieldNames )